tilt api docs are missing info for v1alpha1 types

[landism]

Expected Behavior

these docs show the fields' types

Current Behavior

the fields are described in the docs for the types' constructors (for example) but not the types

Context

I opened the api docs and cmd+f'd uitextinput and found docs that looked like they were what I wanted, but were missing the info I needed, and assumed the info I needed was just missing. (I didn't realize we had separate ctor and type docs)

[nicks]

ya, i remember this, a bit of context on it:

• Officially, starlark doesn't support user-defined classes (i.e., the class keyword)
• All new types must be built into the runtime.
• We model these new types as built-in dicts. Notably, they're dicts with keys, not structs with fields.
• We might be able to handle this in the docgen with the TypedDict stuff https://docs.python.org/3/library/typing.html#typing.TypedDict
• The starlark-native docgenerator really punts on this and kind of handles it in weird ways.